drm/edid: sound/core: pcm_drm_eld.c compilation error in 4.2

[Jean-Francois Moine]

The file sound/core/pcm_drm_eld.c which was added by the commit

        838d1631b766529213684f07dd71cdf2e92f0623
        ALSA: pcm: add DRM ELD helper

lacks the function drm_eld_sad() which was defined by Russell's patch

        http://article.gmane.org/gmane.linux.ports.arm.kernel/411574
        drm/edid: add function to help find SADs

This patch has not been applied.

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